266782223381 has 2 divisors, whose sum is σ = 266782223382. Its totient is φ = 266782223380.

The previous prime is 266782223243. The next prime is 266782223399. The reversal of 266782223381 is 183322287662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263774688100 + 3007535281 = 513590^2 + 54841^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266782223381 is a prime.

It is a super-2 number, since 2×266782223381² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266782223681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133391111690 + 133391111691.

It is an arithmetic number, because the mean of its divisors is an integer number (133391111691).

Almost surely, 2^266782223381 is an apocalyptic number.

It is an amenable number.

266782223381 is a deficient number, since it is larger than the sum of its proper divisors (1).

266782223381 is an equidigital number, since it uses as much as digits as its factorization.

266782223381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2322432, while the sum is 50.

The spelling of 266782223381 in words is "two hundred sixty-six billion, seven hundred eighty-two million, two hundred twenty-three thousand, three hundred eighty-one".